CN101499992A - Decoding device and method, receiving device and method, and program - Google Patents
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- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3818—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers
- H04L27/3827—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers in which the carrier is recovered using only the demodulated baseband signals
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- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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Abstract
The invention relates to a decoding device, a receiving device , a method and a program. Disclosed herein is a decoding device that decodes demodulated data obtained by demodulating a quadrature modulated signal arising from digital modulation of a carrier and detects synchronization, the decoding device including, a decoder configured to decode first demodulated data that is the demodulated data obtained by demodulating the quadrature modulated signal and is composed of in-phase axis data and quadrature axis data, and decode second demodulated data obtained by interchanging the in-phase axis data and the quadrature axis data of the first demodulated data, and a synchronization detector configured to detect a boundary between predetermined information symbol sequences from first decoded data obtained by decoding the first demodulated data and detect the boundary from second decoded data obtained by decoding the second demodulated data, the synchronization detector selecting and outputting one of the first decoded data and the second decoded data based on a result of the detection of the boundary.
Description
Technical field
The present invention relates to decoding device and method, receiving equipment and method and program, and more specifically, though relate to its each also allow decoding device and method, receiving equipment and method and the program of high-speed synchronous when being inverted (invert) at frequency spectrum.
Background technology
As everyone knows, if quadrature amplitude modulation (QAM) is used as one of many level (multilevel) QAM scheme, then the data after the demodulation comprise the phase ambiguity (phase ambiguity) of 0 degree, 90 degree, 180 degree and 270 degree, and this is owing to can not determine absolute phase in demodulation process.
Scheme as the association area that is used to remove this phase ambiguity, for example proposed a kind of at " Rotationally Invariant Convolutional Channel Coding with ExpandedSignal Space-Part II:Nonlinear Codes (utilize the invariable rotary convolution chnnel coding-second portion in spread signal space: nonlinear code) " (IEEE Journal on selected areas incommunications, Vol.SAC-2, No.5, Sep.1984) code modulation system that is described in (hereinafter this document being called document 1).
In the scheme that document 1 is proposed, modulated at transmitter side through relative (relative) phase data of difference (differential) coding, and at receiver side, the relative phase data after the demodulation are by differential decoding, so that be converted into the absolute phase data.Even this makes when phase place is rotated mobile (90 degree, 180 degree, 270 degree) between modulation and demodulation, also can obtain correct data.
In addition, as disclosed in the flat 9-247226 of Japanese Patent Laid Open Publication No. (being called patent documentation 1 hereinafter), a kind of scheme has also been proposed, in this scheme, if the upper sideband of the frequency spectrum in demodulation and the relation between the lower sideband are opposite with relation in modulation, then lineups and normal axis are converted subduing the fuzzy of (absorb) quadrature phase thus, and therefore stably carry out demodulation.In addition, also proposed a kind of scheme, in this scheme, at the situation of rotational symmetric signal constellation (in digital modulation), the position configuration of data is changed, to obtain a kind of effect that is equal in the state that lineups and normal axis exchanged thus.
That is, propose the technology of patent documentation 1 so that solve following problem: the technology of document 1 can not obtain correct data if frequency spectrum is inverted between modulation and demodulation.
Summary of the invention
Yet in the technology of the association area of the technology that comprises patent documentation 1 and document 1, whether frequency spectrum is inverted is by the synchronous regime that obtains in the processing of following stages (post-stage) and the feedback of mistake measurement result are judged.Therefore, the technology of association area relates to a such problem: if frequency spectrum is inverted, then compare with the situation that frequency spectrum is not inverted, obtain correct decoded data with taking a long time.
In addition, in some cases, synchronous regime and error detection result also are subjected to the influence of the factor the noise on transmission path except the influence that is subjected to reversing spectrum.Therefore, when not obtaining synchronously or when a lot of mistake had appearred in discovery, even lineups and normal axis are exchanged, demodulation also can be lost efficacy usually.
In order to address this problem, can use a kind of mechanism that changes the details of demodulation process according to various factors.Yet the situation that needs situation that this mechanism is inverted at frequency spectrum and frequency spectrum not to be inverted changes the details of demodulation process, therefore relates to a problem again: needs spend the longer time and obtain correct decoded data.
Need not to attempt once more synchronous detecting etc. even need the present invention when frequency spectrum is inverted, also to allow high-speed synchronous.
According to one embodiment of present invention, provide a kind of demodulating data that the orthogonal demodulation signal that produces from the digital modulation of carrier wave by demodulation is obtained to decode and detected synchronous decoding device.This decoding device comprises decoder, this decoder is configured to first demodulating data is decoded, described first demodulating data is the described demodulating data that obtains by the described orthogonal demodulation signal of demodulation and be made up of lineups data and normal axis data, and described decoder is decoded to second demodulating data that the described lineups data by exchanging described first demodulating data and described normal axis data obtain.This decoding device also comprises synchronizing indicator, this synchronizing indicator is configured to from the border between first decoded data detection predetermined information symbol sebolic addressing that obtains by described first demodulating data of decoding, and detects described border from second decoded data that obtains by described second demodulating data of decoding.One of described first decoded data and described second decoded data are selected and exported to described synchronizing indicator based on the testing result to described border.
According to embodiments of the invention, a kind of coding/decoding method that is used for decoding device also is provided, the demodulating data that this decoding device obtains the orthogonal demodulation signal that produces from the digital modulation of carrier wave by demodulation is decoded and is detected synchronously.This coding/decoding method may further comprise the steps: first demodulating data is decoded, described first demodulating data is the described demodulating data that obtains by the described orthogonal demodulation signal of demodulation and be made up of lineups data and normal axis data, and second demodulating data that the described lineups data by exchanging described first demodulating data and described normal axis data obtain is decoded.This coding/decoding method is further comprising the steps of: from the border between first decoded data detection predetermined information symbol sebolic addressing that obtains by described first demodulating data of decoding, and detect described border from second decoded data that obtains by described second demodulating data of decoding, and select and export one of described first decoded data and described second decoded data based on testing result to described border.
According to embodiments of the invention, also provide a kind of program of the above-mentioned coding/decoding method corresponding to according to a first aspect of the invention.
In decoding device, coding/decoding method and program according to a first aspect of the invention, first demodulating data as the described demodulating data that obtains by the described orthogonal demodulation signal of demodulation and be made up of lineups data and normal axis data is decoded, and second demodulating data that the described lineups data by exchanging described first demodulating data and described normal axis data obtain is decoded.In addition, detect border between the predetermined information symbol sebolic addressing from first decoded data that obtains by described first demodulating data of decoding, and detect described border between the described predetermined information symbol sebolic addressing from second decoded data that obtains by described second demodulating data of decoding.Based on the result of Boundary Detection, select and export any of first decoded data and second decoded data.
According to another embodiment of the present invention, provide the receiving equipment of a kind of reception from the orthogonal demodulation signal of the digital modulation generation of carrier wave.This receiving equipment comprises decoder, this decoder is configured to first demodulating data is decoded, described first demodulating data is the demodulating data that obtains by the described orthogonal demodulation signal of demodulation and be made up of lineups data and normal axis data, and described decoder is decoded to second demodulating data that the described lineups data by exchanging described first demodulating data and described normal axis data obtain.This receiving equipment also comprises synchronizing indicator, this synchronizing indicator is configured to from the border between first decoded data detection predetermined information symbol sebolic addressing that obtains by described first demodulating data of decoding, and detects described border from second decoded data that obtains by described second demodulating data of decoding.One of described first decoded data and described second decoded data are selected and exported to described synchronizing indicator based on the testing result to described border.
According to embodiments of the invention, a kind of method of reseptance that is used for receiving equipment also is provided, this receiving equipment receives the orthogonal demodulation signal that produces from the digital modulation of carrier wave.This method of reseptance may further comprise the steps: first demodulating data is decoded, described first demodulating data is the demodulating data that obtains by the described orthogonal demodulation signal of demodulation and be made up of lineups data and normal axis data, and second demodulating data that the described lineups data by exchanging described first demodulating data and described normal axis data obtain is decoded.This method of reseptance is further comprising the steps of: from the border between first decoded data detection predetermined information symbol sebolic addressing that obtains by described first demodulating data of decoding, and detect described border from second decoded data that obtains by described second demodulating data of decoding, and select and export one of described first decoded data and described second decoded data based on testing result to described border.
According to embodiments of the invention, also provide a kind of corresponding to the program of above-mentioned method of reseptance according to an embodiment of the invention.
In receiving equipment, method of reseptance and program according to an embodiment of the invention, first demodulating data as the described demodulating data that obtains by the described orthogonal demodulation signal of demodulation and be made up of lineups data and normal axis data is decoded, and second demodulating data that the described lineups data by exchanging described first demodulating data and described normal axis data obtain is decoded.In addition, detect border between the predetermined information symbol sebolic addressing from first decoded data that obtains by described first demodulating data of decoding, and detect described border between the described predetermined information symbol sebolic addressing from second decoded data that obtains by described second demodulating data of decoding.Based on the result of Boundary Detection, select and export any of first decoded data and second decoded data.
In the above described manner, even embodiments of the invention allow also to carry out the synchronous of high speed when frequency spectrum is inverted.
Description of drawings
Fig. 1 shows the block diagram of the configuration of decoding device according to an embodiment of the invention;
Fig. 2 shows the diagrammatic sketch of example of the signal constellation (in digital modulation) of the demodulating data that is input to decoding device;
Fig. 3 shows the diagrammatic sketch of example of the signal constellation (in digital modulation) of the demodulating data when frequency spectrum is inverted;
Fig. 4 shows the not block diagram of the example of the detailed configuration of coded data selector;
Fig. 5 shows the block diagram of example of the detailed configuration of coded data decoder;
Fig. 6 shows the block diagram of example of another detailed configuration of coded data decoder;
Fig. 7 shows the diagrammatic sketch of example of the I/O data of synchronizing indicator;
Fig. 8 shows the block diagram of example of the detailed configuration of synchronizing indicator;
Fig. 9 is the flow chart that is used to illustrate decoding processing;
Figure 10 flow chart that to be the not coded data selector that is used for key diagram 4 handle the selection of coded data not;
Figure 11 is used for the flow chart of the coded data decoder of key diagram 5 to the decoding processing of coded data;
Figure 12 is used for the flow chart of the coded data decoder of key diagram 6 to the decoding processing of coded data;
Figure 13 is used for the flow chart that the synchronous detecting of the synchronizing indicator of key diagram 8 is handled; And
Figure 14 shows according to an embodiment of the invention the block diagram of ios dhcp sample configuration IOS DHCP of carrying out the computer of decoding processing based on software.
Embodiment
Embodiments of the invention are described below with reference to the accompanying drawings.
Fig. 1 shows the block diagram of the configuration of decoder according to an embodiment of the invention.
The decoding device 1 of Fig. 1 can be applied to the receiving equipment that receives orthogonal demodulation signal, and this orthogonal demodulation signal is from by producing the digital modulation of multilevel quadrature amplitude modulation(PAM) to carrier wave such as QAM.
Particularly, as shown in Figure 1, decoding device 1 comprises not coded data candidate detector 11, delayer 12, not coded data selector 13, branch metric (branch metric) calculator 14, Viterbi decoder 15, convolution coder 16, coded data decoder 17, parallel/serial (P/S) transducer 18 and synchronizing indicator 19.
Lineups data I and normal axis data Q are transfused to decoding device 1 as the demodulating data that is for example obtained by the 64-QAM demodulation.
To each unit in the decoding device 1 be described by random sequence below.If the input demodulating data is the convolutional encoding data, then branch metric calculator 14 Branch Computeds are measured, and the Viterbi decoder 15 that is used for following stages carries out the Viterbi decoding.Branch metric calculator 14 outputs to Viterbi decoder 15 with the branch metric that calculates.
Viterbi decoder 15 is used to carry out the Viterbi decoding from the branch metric of branch metric calculator 14, to generate Viterbi decoded data V thus.Viterbi decoder 15 outputs to convolution coder 16 and coded data decoder 17 with the Viterbi decoded data V that generates.
If the Viterbi decoded data V from Viterbi decoder 15 is prior encoded data, then 17 pairs of these Viterbi decoded datas of coded data decoder V carries out other predetermined decoding processing.
Particularly, 17 couples of Viterbi decoded data V from Viterbi decoder 15 of coded data decoder carry out predetermined decoding and handle, and will output to P/S transducer 18 from the decoded data C1 that decoding processing obtains.In addition, coded data decoder 17 outputs to P/S transducer 18 simultaneously with decoded data C2 and decoded data C1.Decoded data C2 is corresponding to the data by the coded data of demodulating data is decoded and obtained, the situation that described demodulating data is exchanged corresponding to lineups data I and normal axis data Q.
The back will be described the details of the decoding processing of coded data decoder 17 with reference to figure 5 and Fig. 6.
11 pairs of the coded data candidate detectors demodulating data that is input to decoding device 1 is not made hard decision (hard decision), and detects not bits of coded candidate from this demodulating data.Coded data candidate detector 11 does not output to delayer 12 with detected not coded data candidate.
12 pairs of delayers postpone from the not coded data candidate of coded data candidate detector 11 not so that these not the coded data candidate with corresponding to these not the convolutional encoding data E of coded data candidate be input to not coded data selector 13 simultaneously.Delayer 12 outputs to not coded data selector 13 with delayed not coded data candidate S.
Be transfused to not coded data selector 13 from the not coded data candidate S of delayer 12 with from the convolutional encoding data E of convolution coder 16.
Not coded data selector 13 based on convolutional encoding data E never coded data candidate S select not coded data U1, and will be not coded data U1 output to P/S transducer 18.In addition, not coded data selector 13 not coded data U2 output to P/S transducer 18 simultaneously with coded data U1 not.Coded data U2 is not corresponding to such demodulating data, the situation that this demodulating data is exchanged corresponding to lineups data I and normal axis data Q.
The back will with reference to 4 couples in figure not the details handled of the selection of coded data selector 13 be described.
From the not coded data U1 of coded data selector 13 not and coded data U2 and be imported into P/S transducer 18 not from the decoded data C1 and the decoded data C2 of coded data decoder 17.
P/S transducer 18 not coded data U1 and decoded data C1 is converted to serial data according to predefined procedure from parallel data, and the serial data D1 that is converted to is outputed to synchronizing indicator 19.In addition, P/S transducer 18 not coded data U2 and decoded data C2 is converted to serial data according to predefined procedure from parallel data, and the serial data D2 that is converted to is outputed to synchronizing indicator 19.
Synchronizing indicator 19 is attempted detect the border between the information symbol sequence (information symbol sequence) from the serial data D1 of P/S transducer 18 and serial data D2.The serial data D that synchronizing indicator 19 will therefrom can detect the serial data D1 on border and serial data D2 outputs to the circuit (not shown) of following stages, the border (being called sideband signal hereinafter) between this signal F indication information symbol sebolic addressing with signal F.
The details that the detection of synchronizing indicator 19 is handled will be described with reference to figure 7 and Fig. 8 in the back.
Constituted decoding device 1 based on above-mentioned configuration.
The summary of the configuration of decoding device 1 has been described with reference to figure 1 above.Next, the detailed configuration of decoding device 1 will be described with reference to figs. 2 to Fig. 8.Hereinafter, with the configuration of mainly describing as not coded data selector 13, coded data decoder 17 and synchronizing indicator 19 among Fig. 1 of the peculiar configuration of present embodiment.
At first, will be input to the signal constellation (in digital modulation) of the demodulating data of decoding device 1 referring to figs. 2 and 3 description.
Fig. 2 shows the diagrammatic sketch of example of the signal constellation (in digital modulation) of the demodulating data that is input to decoding device 1.In Fig. 2, show the 16-QAM constellation as the signal constellation (in digital modulation) example in order to simplify to describe.
With reference to figure 2, be presented on value below each signaling point of dark circles and white circular indication (i1i0, q1q0) in the middle of, i1 and i0 represent two place values of lineups (I axle) data, and q1 and q0 represent two place values of normal axis (Q axle) data.In the middle of i1 and i0, i1 represents not bits of coded and i0 represents bits of coded.In the middle of q1 and q0, q1 represents not bits of coded and q0 represents bits of coded.
On the IQ plane of Fig. 2, four circles have been presented in each in that first quartile to the is four-quadrant.These four circle expression signaling points.Be present in separately the quadrant by each of four signaling points of white circular indication, these four signaling points are positioned at by revolve at every turn and turn 90 degrees the position that obtains.The not bits of coded i1 of all these four signaling points and the value that bits of coded q1 is not right are equal to each other, and the i0 of bits of coded of all these four points and bits of coded q0 is right value differ from one another.In addition, be positioned at the identical characteristic of characteristic that also has the signaling point of representing with white circular by four signaling points of indicating that revolve the position that the phase place rotation that turn 90 degrees obtains at every turn in each quadrant by dark circles.
In the sort signal constellation example, if the demodulating data that for example is input to decoding device 1 is corresponding to the cross mark on the IQ plane of Fig. 2, then not coded data candidate detector 11 outputs (0 of Fig. 1,0), (0,1), (1,0) and (1,1) four pairs of conducts be used for not coded data (i1, candidate q1).
On the other hand, if the signal constellation (in digital modulation) example based on Fig. 2 is inverted from the frequency spectrum of modulating the 16-QAM signal that produces, then as shown in Figure 3, demodulating data with respect to through 45 degree straight lines of the initial point of lineups and normal axis and about straight line symmetrically (line-symmetrically) exchanged, with the data of the signal constellation (in digital modulation) shown in becoming on the IQ plane that is equal to Fig. 3.If frequency spectrum is inverted, the signaling point that then for example is transmitted (01,11) in the position of signaling point (11,01) by demodulation, and the signaling point that is transmitted (10,10) in the position of signaling point (10,10) by demodulation.That is, on the IQ plane of Fig. 3, if become the not coded data of one of signaling point about the straight line symmetric relation be (i1, q1), then the not coded data of another signaling point be (q1, i1).
As shown in Figure 1, (i1 q1) is being delayed after device 12 postpones predetermined amount of delay, is imported into not coded data selector 13 as coded data candidate S not from the not coded data of coded data candidate detector 11 not.In addition, as mentioned above, (i0 q0) also is imported into not coded data selector 13 from the convolutional encoding data E of convolution coder 16.
Fig. 4 is the block diagram of example of detailed configuration that the not coded data selector 13 of Fig. 1 is shown.
As shown in Figure 4, coded data selector 13 does not comprise not the bits of coded selector 31 and the not bits of coded maker 32 of IQ (IQ-inverted) that reverses.
For the signal constellation (in digital modulation) example of Fig. 2, not bits of coded selector 31 based on from the convolutional encoding data E of convolution coder 16 always self-dalay device 12 four couples coded data candidate S select not a pair of.Bits of coded selector 31 does not output to selected not coded data U1 P/S transducer 18 and reverses not bits of coded maker 32 of IQ.
Counter-rotating IQ not bits of coded maker 32 based on the not bits of coded U2 that generates the situation that is inverted corresponding to frequency spectrum by the 31 selected not coded data U1 of bits of coded selector not.
Following description for example will be handled such situation, and wherein, the demodulating data that is input to decoding device 1 is corresponding to the cross mark in the signal constellation (in digital modulation) of Fig. 2.
If from the convolutional encoding data E of convolution coder 16 (i0 q0) is (0,0), then not 31 outputs (0,1) of bits of coded selector as coded data U1 not.Similarly, if (i0 q0) is (0,1), (1,0) or (1,1) to convolutional encoding data E, and then bits of coded selector 31 is not exported not coded data U1 of (1,1), (0,0) or (1,0) conduct respectively.
If from the not coded data U1 of bits of coded selector 31 not are (0,0), then reverse IQ not 32 outputs (0,0) of bits of coded maker as coded data U2 not.Similarly, if coded data U1 is not (0,1), (1,0) or (1,1), then reverse IQ not bits of coded maker 32 export (1,0), (0,1) or (1,1) respectively as coded data U2 not.
By this way, the not coded data U2 of the situation that is inverted corresponding to frequency spectrum can generate by the position that exchanges the not coded data U1 in the coded data selector 13 not.Therefore, coded data selector 13 can not generate the not coded data U2 that produced by the counter-rotating of frequency spectrum and coded data U1 not normally.That is, coded data selector 13 does not always generate not coded data U2 yet, and itself and the output of coded data U1 is not side by side outputed to the P/S transducer 18 of following stages.
For convenience the 16-QAM system is used as the example of present embodiment.But, in the situation of the other 1-Q modulation systems such as 64-QAM or 256-QAM, also can generate not coded data U2 by similar processing.Certainly, if not coded data U1 and not the relation between the coded data U2 be such, promptly except position exchange, also need intended conversion to generate not coded data U2, then can generate not coded data U2 by carrying out this intended conversion at coded data U1 not.
On the other hand, as top described with reference to figure 1, the Viterbi decoded data V that is used to generate by the Viterbi decoding from the branch metric of branch metric calculator 14 by Viterbi decoder 15 goes back input encoded data decoder 17 except input convolution coder 16.
Fig. 5 shows the block diagram of example of the detailed configuration of coded data decoder 17.
The coded data decoder 17 of Fig. 5 corresponding to from the Viterbi decoded data V of the Viterbi decoder 15 of Fig. 1 by two situations of forming, and comprise differential decoder 41 and differential decoder 42.
In the coded data decoder 17 of Fig. 5,41 pairs of Viterbi decoded datas of differential decoder V in Fig. 5 top carries out normal differential decoding (situation that differential decoding is not inverted corresponding to frequency spectrum), and the decoded data C1 that differential decoding obtains is outputed to P/S transducer 18.On the other hand, the differential decoder 42 of Fig. 5 bottom is carried out differential decoding after lineups position that exchanges Viterbi decoded data V and normal axis position, and the decoded data C2 that differential decoding obtains is outputed to P/S transducer 18.In each of differential decoder 41 and differential decoder 42, carry out differential decoding corresponding to disclosed differential coding in the above-mentioned document 1.
By this way, the coded data decoder 17 of Fig. 5 can be exported the decoded data C2 of the situation that is inverted corresponding to frequency spectrum in the normal decoded data C1 of output.Therefore, if frequency spectrum is not inverted, be correct decoded data by the decoded data C1 that differential decoding obtains then by differential decoder 41.On the other hand, if frequency spectrum is inverted, then differential decoder 42 can correctly be decoded to Viterbi decoded data V, and therefore decoded data C2 is correct decoded data.The coded data decoder 17 of Fig. 5 all outputs to the P/S transducer 18 of following stages with decoded data C1 and decoded data C2, and no matter which is correct decoded data.
In the coded data decoder 17 of Fig. 5, two differential decoders are provided, be differential decoder 41 and differential decoder 42, and the situation that is not inverted of the situation that is inverted at frequency spectrum and frequency spectrum the two carry out differential decoding concurrently to the Viterbi decoded data.But obviously the configuration below also is available.Particularly, for example, a differential decoder only is provided and shares circuit, carry out differential decoding to allow the two Viterbi decoded data V of situation that situation that this differential decoder is not inverted frequency spectrum and frequency spectrum be inverted thus according to the operation of double-speed.
The configuration of the coded data decoder 17 of Fig. 1 is not limited to the configuration shown in Fig. 5, and for example can be the configuration shown in Fig. 6.For the coded data decoder 17 of Fig. 6, be endowed identical label with same section in the coded data decoder 17 of Fig. 5, and omit description, to avoid redundant duplicate explanation to the part of carrying out same treatment.
The coded data decoder 17 of Fig. 6 is to provide counter-rotating IQ decoded data maker 43 to replace differential decoder 42 with the difference among Fig. 5.Decoded data C1 from differential decoder 41 is transfused to counter-rotating IQ decoded data maker 43.
43 couples of decoded data C1 from differential decoder 41 of counter-rotating IQ decoded data maker carry out the predetermined process corresponding to the configuration of differential decoder 41, with generating solution code data C2 thus.Counter-rotating IQ decoded data maker 43 outputs to P/S transducer 18 with the decoded data C2 that is generated.
Described predetermined process refers to be equal to the processing from the decoded data C1 of differential decoder 41 output to the conversion of the decoded data C2 of differential decoder 42 outputs among Fig. 5.Therefore, the coded data decoder 17 of Fig. 6 can be exported the decoded data C2 of the situation that is inverted corresponding to frequency spectrum in the normal decoded data C1 of output.
By this way, in the present embodiment, the coded data of the situation that is inverted corresponding to frequency spectrum can be decoded, perhaps, can generate this decoded data when the normal encoding data that do not have reversing spectrum are decoded.
As shown in Figure 1, the not coded data U1 of coded data selector 13 output never and coded data U2 and the decoded data C1 and the decoded data C2 that export from coded data decoder 17 are not transfused to P/S transducer 18.P/S transducer 18 will be by being converted to serial data from the not coded data U1 of coded data selector 13 not with from the parallel data that the decoded data C1 of coded data decoder 17 constitutes according to predetermined position order, and export these data as serial data D1.Except output serial data D1, P/S transducer 18 also will be by being converted to serial data from the not coded data U2 of coded data selector 13 not with from the parallel data that the decoded data C2 of coded data decoder 17 constitutes according to predetermined position order, and export these data as serial data D2.
Because this operation, if serial data D1 and serial data D2 do not comprise faults, then from the serial data D1 of P/S transducer 18 and serial data D2 as (for example frame 1 by a succession of frame shown in " D1/D2 " of Fig. 7 top, frame 2, ...) data that constitute are imported into synchronizing indicator 19, each of a succession of frame is made of the synchronization character of information symbol sequence and indication frame boundaries.
Synchronizing indicator 19 detects the synchronization character of indication frame boundaries (border between the predetermined information symbol sebolic addressing), and selects can therefrom detect the data of synchronization character as serial data D from serial data D1 and serial data D2.Shown in " F " and " D " of Fig. 7 bottom, synchronizing indicator 19 outputs to the circuit of following stages with selected serial data D with the sideband signal F of indication frame boundaries.
The detailed configuration of synchronizing indicator 19 is described below with reference to Fig. 8.
As shown in Figure 8, synchronizing indicator 19 comprises synchronization character maker 51, correlation calculator 52, correlation calculator 53, controller 54 and selector 55.
Be imported into correlation calculator 52 from the serial data D1 of P/S transducer 18 and the synchronization character that generates by synchronization character maker 51.Correlation calculator 52 calculates the correlation between serial data D1 and the synchronization character, and correlation is outputed to controller 54 as result of calculation.
Be imported into correlation calculator 53 from the serial data D2 of P/S transducer 18 and the synchronization character that generates by synchronization character maker 51.Be similar to correlation calculator 52, correlation calculator 53 calculates the correlation between serial data D2 and the synchronization character, and correlation is outputed to controller 54.
Each correlation from correlation calculator 52 and correlation calculator 53 is transfused to controller 54.Controller 54 will preset dependent thresholds with from two correlations of correlation calculator 52 and correlation calculator 53 inputs relatively, and will output to selector 55 corresponding to the selection signal Sc of comparative result.
Particularly, for example, the correlation of serial data D2 is less than dependent thresholds if the correlation of serial data D1 is equal to or greater than dependent thresholds, and then controller 54 will be indicated and be selected the selection signal Sc of serial data D1 to output to selector 55.On the other hand, if the correlation of the correlation of serial data D1 serial data D2 less than dependent thresholds is equal to or greater than dependent thresholds, then controller 54 will be indicated and be selected the selection signal Sc of serial data D2 to output to selector 55.In addition, if the correlation of serial data D1 less than the correlation of dependent thresholds and serial data D2 less than dependent thresholds, if perhaps the correlation of the serial data D1 correlation that is equal to or greater than dependent thresholds and serial data D2 is equal to or greater than dependent thresholds, then controller 54 will be indicated and be selected the selection signal Sc of predetermined serial data (for example, serial data D1) to output to selector 55.Perhaps, if the correlation of serial data D1 is equal to or greater than the correlation of dependent thresholds and serial data D2 and is equal to or greater than dependent thresholds, then controller 54 will be indicated and be selected its correlation to output to selector 55 greater than the selection signal Sc of the serial data of the correlation of another serial data.
From the serial data D1 and the serial data D2 of P/S transducer 18 and come the selection letter Sc of self-controller 54 to be transfused to selector 55.Selector 55 is selected among serial data D1 and the serial data D2 any based on the selection signal Sc that comes self-controller 54, and selected data is outputed to the circuit (not shown) of following stages as serial data D.
In addition, as shown in Figure 7, controller 54 when will selecting signal Sc to output to selector 55, will with serial data D synchronous, indication outputs to the circuit (not shown) of following stages corresponding to the sideband signal F of the frame boundaries in the serial data of selecting signal Sc.
In the synchronizing indicator 19 of Fig. 8, two correlation calculators are provided, i.e. correlation calculator 52 and correlation calculator 53, and the situation that is not inverted of the situation that is inverted at frequency spectrum and frequency spectrum is calculated the correlation between serial data and the synchronization character.But obviously the configuration below also is available.Particularly, for example, a correlation calculator only is provided and shares circuit, calculate correlation with the situation that allows situation that this correlation calculator is not inverted at frequency spectrum and frequency spectrum to be inverted thus based on the operation of double-speed.
In the above described manner, the serial data of the situation that is not inverted at frequency spectrum and the serial data of the situation that frequency spectrum is inverted, synchronous detecting is carried out simultaneously, and it is selected therefrom can to detect synchronous serial data.Therefore, no matter whether frequency spectrum is inverted, and synchronous detecting can be performed in the needed time being equal to the situation of not considering reversing spectrum and carrying out normal process.
Below processing performed in the decoding device 1 will be described.
At first, will be with reference to the decoding processing of the flow chart description decoding device 1 of figure 9.
At step S1,11 pairs of coded data candidate detectors input demodulating data is not made hard decision, and detects at the candidate of bits of coded not, so that candidate is outputed to delayer 12.
At step S2, delayer 12 will be from after the not coded data candidate of coded data candidate detector 11 postpone, with these not the coded data candidate output to not coded data selector 13 so that these not the coded data candidate can with corresponding to these not the convolutional encoding data E of coded data candidate be input to not coded data selector 13 simultaneously.
At step S3, if the input demodulating data is the convolutional encoding data, then branch metric calculator 14 Branch Computeds are measured and it are outputed to Viterbi decoder 15.
At step S4, Viterbi decoder 15 is used to carry out the Viterbi decoding from the branch metric of branch metric calculator 14, and will output to convolution coder 16 and coded data decoder 17 by the Viterbi decoded data V that the Viterbi decoding obtains.
At step S5,16 couples of Viterbi decoded data V from Viterbi decoder 15 of convolution coder encode, and will output to not coded data selector 13 by the convolutional encoding data E that coding obtains.
At step S6, coded data selector 13 is carried out following processing: based on convolutional encoding data E never coded data candidate S select not coded data U1, and generate with the corresponding not coded data of the demodulating data U2 of the situation that is exchanged corresponding to lineups data I and normal axis data Q (hereinafter, this processing is called not coded data select processing).Not coded data selector 13 not coded data U1 and not coded data U2 output to P/S transducer 18.
After a while will with reference to the flow chart description of Figure 10 not coded data select the details handled.
At step S7, coded data decoder 17 is carried out following the processing: handles and obtains decoded data C1 by the Viterbi decoded data V from Viterbi decoder 15 being carried out predetermined decoding, and acquisition and the corresponding decoded data C2 of data (decoding processing that hereinafter this processing is called coded data) by the coded data of the demodulating data of the situation that exchanged corresponding to lineups data I and normal axis data Q is decoded and obtained.Coded data decoder 17 outputs to P/S transducer 18 with decoded data C1 and decoded data C2.
After a while will be with reference to the details of the decoding processing of the flow chart description coded data of Figure 11 and 12.
At step S8, P/S transducer 18 not coded data U1 and decoded data C1 constitute to and not coded data U2 and decoded data C2 constitute to being converted to serial data from parallel data according to predefined procedure, and serial data D1 and the serial data D2 that is converted to outputed to synchronizing indicator 19.
At step S9, synchronizing indicator 19 is carried out following the processing: attempt detecting the information symbol sequence border from the serial data D1 and the serial data D2 of P/S transducer 18, and with in the middle of serial data D1 and the serial data D2 therefrom the serial data D of detection boundaries output to following stages with sideband signal F the circuit (not shown) (hereinafter, this processing is called synchronous detecting to be handled), finish decoding processing thus.
The details that to handle with reference to the flow chart description synchronous detecting of Figure 13 after a while.
With reference to the flow chart of Figure 10, will describe the not coded data of carrying out by the not coded data selector 13 of Fig. 4 below and select to handle corresponding to the processing of the step S6 among Fig. 9.
At step S11, not bits of coded selector 31 based on from the convolutional encoding data E of convolution coder 16 for example always four of self-dalay device 12 groups not coded data candidate S select one group, and selected not coded data U1 is outputed to not bits of coded maker 32 of P/S transducer 18 and counter-rotating IQ.
At step S12, counter-rotating IQ not bits of coded maker 32 generates the not bits of coded U2 of the situation that is inverted corresponding to frequency spectrum based on the not coded data U1 that is selected by bits of coded selector not 31, and bits of coded U2 does not output to P/S transducer 18.
Because this operation, bits of coded U2 side by side is not imported into P/S transducer 18 with coded data U1 not yet.After this, handle the processing that sequence turns back to the step S6 among Fig. 9.
With reference to the flow chart of Figure 11, the decoding processing of being carried out by the coded data decoder 17 of Fig. 5 corresponding to the coded data of the processing of the step S7 among Fig. 9 will be described below.
At step S21,41 pairs of Viterbi decoded datas of differential decoder V carries out normal differential decoding and handles, and will output to P/S transducer 18 from the decoded data C1 that this processing obtains.
At step S22, differential decoder 42 is carried out differential decoding after lineups position that has exchanged Viterbi decoded data V and normal axis position, and will output to P/S transducer 18 from the decoded data C2 that differential decoding obtains.
Because this operation, decoded data C2 and decoded data C1 side by side also are imported into P/S transducer 18.After this, handle the processing that sequence turns back to the step S7 among Fig. 9.
With reference to the flow chart of Figure 12, the decoding processing of being carried out by the coded data decoder 17 of Fig. 6 corresponding to the coded data of the processing of the step S7 among Fig. 9 will be described below.
At step S31, be similar to the processing of the step S21 among Figure 11, carry out normal differential decoding by differential decoder 41 and handle, and will output to P/S transducer 18 and counter-rotating IQ decoded data maker 43 from the decoded data C1 that this processing obtains.
At step S32,43 couples of decoded data C1 from differential decoder 41 of counter-rotating IQ decoded data maker carry out the predetermined process corresponding to the configuration of differential decoder 41, and will output to P/S transducer 18 by the decoded data C2 that this processing generates.
Because this operation is similar to the processing of the flow chart of Figure 11, decoded data C2 and decoded data C1 side by side also are imported into P/S transducer 18.After this, handle the processing that sequence turns back to the step S7 among Fig. 9.
With reference to the flow chart of Figure 13, will describe the synchronous detecting of carrying out by the synchronizing indicator 19 of Fig. 8 below and handle corresponding to the processing of the step S9 among Fig. 9.
At step S41, synchronization character maker 51 generates the synchronization character that is included in the serial data that does not comprise faults, and synchronization character is outputed to correlation calculator 52 and correlation calculator 53.
At step S42, correlation calculator 52 calculates from the serial data D1 of P/S transducer 18 with from the correlation between the synchronization character of synchronization character maker 51, and correlation is outputed to controller 54 as result of calculation.
At step S43, correlation calculator 53 calculates from the serial data D2 of P/S transducer 18 with from the correlation between the synchronization character of synchronization character maker 51, and correlation is outputed to controller 54 as result of calculation.
At step S44, controller 54 will be preset dependent thresholds and compare with two correlations from 53 inputs of correlation calculator 52 and correlation calculator, and will output to selector 55 corresponding to the selection signal Sc of comparative result.
At step S45, selector 55 from from selecting any the serial data D1 of P/S transducer 18 and the serial data D2, and outputs to selected data the circuit (not shown) of following stages based on the selection signal Sc that comes self-controller 54 as serial data D.
At step S46, controller 54 synchronously will be indicated the circuit (not shown) that outputs to following stages corresponding to the sideband signal F of the frame boundaries in the serial data of the selection signal Sc that outputs to selector 55 with serial data D.After this, handle the processing that sequence turns back to the step S9 among Fig. 9.
As mentioned above, according to embodiments of the invention, even the frequency spectrum between the modulation and demodulation is inverted, also allows to carry out high-speed synchronous in the needed time being equal to the situation of not considering reversing spectrum and carrying out normal process, and need not to attempt once more synchronous detecting etc.
Above-mentioned processing sequence can be carried out by hardware, perhaps alternately can be carried out by software.Carried out by software if handle sequence, then the program of this software is installed in the computer that is included in the specialized hardware from program recorded medium, perhaps for example wherein allows to carry out in the general purpose personal computer of various functions by various programs are installed in.
Figure 14 illustrates the block diagram of example of configuration of carrying out the personal computer of above-mentioned processing sequence based on program.CPU (CPU) 111 is carried out various processing according to the program that is recorded in read-only memory (ROM) 112 or the record cell 118.The program that will be carried out by CPU 111, data etc. are stored in the random-access memory (ram) 113.CPU 111, ROM 112 and RAM113 are connected to each other via bus 114.
I/O (I/O) interface 115 also is connected to CPU 111 via bus 114.The input unit 116 that constitutes by microphone etc. and be connected to I/O interface 115 by the output unit 117 that display unit, loud speaker etc. constitutes.CPU 111 is in response to the various processing of command execution via input unit 116 inputs.CPU 111 outputs to output unit 117 with result.
The record cell 118 that is connected to I/O interface 115 is for example by hard disk and be recorded in wherein each kind of data and will be made of the program that CPU 111 carries out.Communication unit 119 is via network such as internet or local area network (LAN) and external device communication.
The program that obtains via communication unit 119 can be recorded in the record cell 118.
When the removable media such as disk, CD, magneto optical disk or semiconductor memory 121 was installed in the driver 120 that is connected to I/O interface 115, driver 120 drove removable medias 121, so that obtain the program that is recorded in wherein, data etc.Program of being obtained and data are sent to record cell 118 as required and are recorded in it.
The program recorded medium that is used for storing the program of the state that is installed in computer and is set to be carried out by this computer for example is made of as shown in figure 14 following entity: as the removable media 121 by formations such as disk (comprising floppy disk), CD (comprising compact disk read-only memory (CD-ROM) and digital versatile disc (DVD)), magneto optical disk, semiconductor memories of encapsulation medium (package medium); The ROM 112 of the interim therein or permanent storage of program; And the hard disk that is used as record cell 118.As required, stored program is by utilizing the wired or wireless communication medium such as local area network (LAN), internet or digital satellite broadcasting to carry out via the communication unit such as router or modulator-demodulator 119 as interface in program recorded medium.
In this manual, the step that description is stored in the program in the recording medium not only comprises the processing of carrying out along described order by time sequence (time-series) mode, and comprises and needn't carry out but processing parallel or that carry out separately by time sequence mode.
Should be noted that embodiments of the invention are not limited to the foregoing description, but various modifications can be included in wherein, and do not depart from the scope of the present invention and spirit.
The present invention comprises the relevant theme of submitting to Japan Patent office with on January 30th, 2008 of Japanese patent application JP2008-018536, by reference its whole contents is incorporated into this.
Claims (10)
1. synchronous decoding device of demodulating data being decoded and detect, described demodulating data are to obtain from the orthogonal demodulation signal that the digital modulation of carrier wave produces by demodulation, and this decoding device comprises:
Decoder, this decoder is configured to first demodulating data is decoded, described first demodulating data is the described demodulating data that obtains by the described orthogonal demodulation signal of demodulation and be made up of lineups data and normal axis data, and described decoder is decoded to second demodulating data that the described lineups data by exchanging described first demodulating data and described normal axis data obtain; And
Synchronizing indicator, this synchronizing indicator is configured to from the border between first decoded data detection predetermined information symbol sebolic addressing that obtains by described first demodulating data of decoding, and detect described border from second decoded data that obtains by described second demodulating data of decoding, one of described first decoded data and described second decoded data are selected and exported to described synchronizing indicator based on the testing result to described border.
2. decoding device according to claim 1, wherein
At least one position of described demodulating data is the differential coding position, and
Described decoder is carried out the differential decoding of described first demodulating data exporting described first decoded data thus, and carries out differential decoding to described second demodulating data to export described second decoded data thus.
3. decoding device according to claim 1, wherein
Predetermined synchronization character is included in the described demodulating data, and
Described synchronizing indicator calculates correlation between described first decoded data and the synchronization character and the correlation between described second decoded data and the described synchronization character, and, select and export one of described first decoded data and described second decoded data based on correlation that obtains by described calculating and the comparative result between the predetermined threshold.
4. decoding device according to claim 1, wherein
At least one position of described demodulating data is the differential coding position, and
Described decoder is carried out the differential decoding of described first demodulating data generating described first decoded data thus, and generates described second decoded data from first decoded data that generates.
5. decoding device according to claim 1 also comprises
Coded data detector not, this not the coded data detector be configured to detect not bits of coded from described demodulating data, wherein
Described not coded data detector is based on described first demodulating data and the data by the decoded data of the bits of coded of described first demodulating data is encoded once more and obtained, and selects first coded data and generate second coded data not corresponding to described second demodulating data not.
6. coding/decoding method that is used for decoding device, the demodulating data that this decoding device obtains the orthogonal demodulation signal that produces from the digital modulation of carrier wave by demodulation is decoded and is detected synchronously, and described coding/decoding method may further comprise the steps:
First demodulating data is decoded, described first demodulating data is the described demodulating data that obtains by the described orthogonal demodulation signal of demodulation and be made up of lineups data and normal axis data, and second demodulating data that the described lineups data by exchanging described first demodulating data and described normal axis data obtain is decoded; And
From the border between first decoded data detection predetermined information symbol sebolic addressing that obtains by described first demodulating data of decoding, and detect described border from second decoded data that obtains by described second demodulating data of decoding, and select and export one of described first decoded data and described second decoded data based on testing result to described border.
7. one kind is used to make computer carry out the program of following decoding processing: the demodulating data that the orthogonal demodulation signal that produces from the digital modulation of carrier wave by demodulation is obtained is decoded and is detected synchronously, and described program may further comprise the steps:
First demodulating data is decoded, described first demodulating data is the described demodulating data that obtains by the described orthogonal demodulation signal of demodulation and be made up of lineups data and normal axis data, and second demodulating data that the described lineups data by exchanging described first demodulating data and described normal axis data obtain is decoded; And
From the border between first decoded data detection predetermined information symbol sebolic addressing that obtains by described first demodulating data of decoding, and detect described border from second decoded data that obtains by described second demodulating data of decoding, and select and export one of described first decoded data and described second decoded data based on testing result to described border.
8. the receiving equipment of the orthogonal demodulation signal that produces from the digital modulation of carrier wave of a reception, this receiving equipment comprises:
Decoder, this decoder is configured to first demodulating data is decoded, described first demodulating data is the demodulating data that obtains by the described orthogonal demodulation signal of demodulation and be made up of lineups data and normal axis data, and described decoder is decoded to second demodulating data that the described lineups data by exchanging described first demodulating data and described normal axis data obtain; And
Synchronizing indicator, this synchronizing indicator is configured to from the border between first decoded data detection predetermined information symbol sebolic addressing that obtains by described first demodulating data of decoding, and detect described border from second decoded data that obtains by described second demodulating data of decoding, one of described first decoded data and described second decoded data are selected and exported to described synchronizing indicator based on the testing result to described border.
9. method of reseptance that is used for receiving equipment, this receiving equipment receive the orthogonal demodulation signal that produces from the digital modulation of carrier wave, and this method of reseptance may further comprise the steps:
First demodulating data is decoded, described first demodulating data is the demodulating data that obtains by the described orthogonal demodulation signal of demodulation and be made up of lineups data and normal axis data, and second demodulating data that the described lineups data by exchanging described first demodulating data and described normal axis data obtain is decoded; And
From the border between first decoded data detection predetermined information symbol sebolic addressing that obtains by described first demodulating data of decoding, and detect described border from second decoded data that obtains by described second demodulating data of decoding, and select and export one of described first decoded data and described second decoded data based on testing result to described border.
10. one kind is used to make computer to carry out the following program of handling that receives: receive the orthogonal demodulation signal that produces from the digital modulation of carrier wave, this program may further comprise the steps:
First demodulating data is decoded, described first demodulating data is the demodulating data that obtains by the described orthogonal demodulation signal of demodulation and be made up of lineups data and normal axis data, and second demodulating data that the described lineups data by exchanging described first demodulating data and described normal axis data obtain is decoded; And
From the border between first decoded data detection predetermined information symbol sebolic addressing that obtains by described first demodulating data of decoding, and detect described border from second decoded data that obtains by described second demodulating data of decoding, and select and export one of described first decoded data and described second decoded data based on testing result to described border.
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| JP2008018536A JP4386135B2 (en) | 2008-01-30 | 2008-01-30 | Decoding device and method, receiving device and method, and program |
| JP2008-018536 | 2008-01-30 | ||
| JP2008018536 | 2008-01-30 |
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| CN101499992A true CN101499992A (en) | 2009-08-05 |
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| US (1) | US8238459B2 (en) |
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| JP5644372B2 (en) | 2010-10-27 | 2014-12-24 | ソニー株式会社 | Signal processing apparatus and method, and program |
| KR101340048B1 (en) | 2012-06-12 | 2013-12-11 | (주)에프씨아이 | Apparatus and method for detecting spectrum inversion |
| CN104601510B (en) * | 2013-10-31 | 2018-09-14 | 晨星半导体股份有限公司 | Signal processing apparatus and method and judge the method whether frequency spectrum of multi-carrier signal inverts |
| US11750360B2 (en) * | 2016-12-06 | 2023-09-05 | Silicon Laboratories Inc. | Apparatus for radio-frequency receiver with multiple operational modes and associated methods |
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| JP2522144B2 (en) * | 1993-01-14 | 1996-08-07 | 日本電気株式会社 | Phase disambiguation circuit |
| US5684832A (en) * | 1993-06-04 | 1997-11-04 | Ntt Mobile Communications Network | Maximum likelihood differential detecting method and differential detector thereof |
| JPH09247226A (en) | 1996-03-14 | 1997-09-19 | Hitachi Ltd | Orthogonal modulation wave demodulation device |
| CN100356785C (en) * | 2003-05-30 | 2007-12-19 | 上海交通大学 | Base band OQAM signal generating method in digital ground broadcasting transmission |
| JP4522197B2 (en) * | 2004-08-31 | 2010-08-11 | 三洋電機株式会社 | Receiving method and apparatus |
| KR100652385B1 (en) * | 2004-11-11 | 2006-12-06 | 삼성전자주식회사 | Terrestrial digital video broadcasting receiver and method for detecting the spectrum inversion |
| TWI271933B (en) * | 2005-06-07 | 2007-01-21 | Realtek Semiconductor Corp | Quadrature amplitude modulation trellis coded modulation decoding apparatus and method thereof |
| US7580469B2 (en) * | 2006-07-06 | 2009-08-25 | Provigent Ltd | Communication link control using iterative code metrics |
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| JP2009182552A (en) | 2009-08-13 |
| JP4386135B2 (en) | 2009-12-16 |
| CN101499992B (en) | 2012-12-26 |
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